The Anodic Polarization Behavior of Nickel in Acidic Chloride Solution

Zamin, M.; Ives, M. B.

doi:10.1149/1.2402001

Cited by 15 publications

(8 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…An electrical lead wire was attached at the center of one side with Pb-Sn solder. Specimen preparation and the cell assembly were identical to that described elsewhere (16)(17)(18). Specimens were mechanically polished to 1 ~m diamond, followed by electropolishing (19) in 60% H2SO4 for 1 rain at 0.5 A/cm 2 and then 2 min at 1.0 A/cm2.…”

Section: Methodsmentioning

confidence: 99%

The Anodic Oxidation of Nickel in 1N H 2 SO 4 Solution

Zamin

Ives

1979

J. Electrochem. Soc.

View full text Add to dashboard Cite

The anodic oxidation of nickel in 1N H2SO4 solution has been studied employing potentiostatic and galvanostatic techniques. It has been found that although a large amount of charge is consumed during anodic oxidation, only about 5% of this charge is involved in film growth. The thickness of the passive film on nickel in 1N H2SO4 is between 6–16Å for anodic oxidation times of 15–60 min. The experimental results have been used to develop a kinetic equation describing the film growth on nickel. It is shown that the logarithm of the film growth current density is inversely proportional to the charge stored in the film. The resistivity of the film suggests that the film is pure and almost stoichiometric normalNiO . It is suggested that the Flade potential of nickel in 1N H2SO4 corresponds to that potential, more noble than the passivation potential, at which the surface of the nickel is covered with a pore‐free film of normalNiO and passivation is complete.

show abstract

Section: Methodsmentioning

confidence: 99%

The Anodic Oxidation of Nickel in 1N H 2 SO 4 Solution

Zamin

Ives

1979

J. Electrochem. Soc.

View full text Add to dashboard Cite

show abstract

“…In the pig 2.8 Na2SO4 solutions, pitting only occurs on open circuit and is due to preferential chemical dissolution of the oxide film at defect sites; pitting attack will not occur if the potential is maintained in the passive region. It is, however, well known that aggressive anions such as C1-can lead to pitting of metals like nickel, iron, stainless steel, etc., even when the potential is maintained in what is normally the passive potential region (6)(7)(8)(9)(10)(11)(12)(13). It is generally felt that the rote of the CI-ion in pitting is related to its ability to effectively destroy the passive oxide film at local points on the surface through its influence on film breakdown and/or repair.…”

mentioning

confidence: 99%

Effect of Chloride Ion on the Localized Breakdown of Nickel Oxide Films

MacDougall

1979

J. Electrochem. Soc.

114

View full text Add to dashboard Cite

The effect of chloride ion on the passivation of nickel is studied and a mechanism for pit initiation on electrodes anodized in Cl−‐containing solutions is proposed. Although Cl− does not directly influence the nickel dissolution reaction, normalNi→Ni2++2e , it does interfere with normalNiO formation and thereby retards passivation. This is manifested by an increase in the anodic passivation charge upon stepping the potential into the passive region. At a constant anodic potential, both the extent of retardation of oxide formation and the probability for pitting increase with increasing [Cl−]. Under conditions where pitting will occur, the anodic current falls substantially during the first 30–60 sec (after the potential step) but then begins to increase as pitting occurs. The original low bulk concentration of Cl− (≤0.1M) was not considered sufficient to cause pitting and this suggests a localized enrichment in Cl− during the 30–60 sec current decay. The oxide film is viewed as undergoing continuous breakdown and repair at localized areas and when sufficient Cl− has accumulated in some areas, repair of the oxide is not possible. For a constant bulk [Cl−], the pitting probability increases sharply with increasing potential of anodization; however, the corresponding extent of oxide retardation actually decreases. This increased pitting probability is explained in terms of the higher rate of nickel dissolution (from oxide‐free areas where the film has broken down) at the higher anodic potential being able to effectively concentrate Cl− in localized areas of the surface. The presence of Cl− ion in the anodizing solution does not result in any change in average oxide film thickness or substantial Cl−incorporation within the film.

show abstract

“…Table 4. 28 lists the major circumstances in which stress corrosion or stress-assisted corrosion of nickel and its alloys have been recorded in service and also shows the preventive and remedial measures that have been adopted, usually with success, in each case.…”

Section: Conjoint Action Of Stress and Corrosion (Chapter 8)mentioning

confidence: 99%

Nickel and Nickel Alloys

Evans¹

1994

Corrosion

View full text Add to dashboard Cite

The Anodic Polarization Behavior of Nickel in Acidic Chloride Solution

Cited by 15 publications

References 2 publications

The Anodic Oxidation of Nickel in 1N H 2 SO 4 Solution

The Anodic Oxidation of Nickel in 1N H 2 SO 4 Solution

Effect of Chloride Ion on the Localized Breakdown of Nickel Oxide Films

Nickel and Nickel Alloys

Contact Info

Product

Resources

About